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Morning Mark,
Most people will probably do it differently but as you already have Gimp it makes it easy.
Heres what i do. shrink down the image to the physical resolution that i would like by going Image > Scale Image.
After that i go File > Export and export the file a as a JPG. When i export the file it will give me a quality slider. Its a bit of trial and error but I generally set it to around 70-90% until i get the file of the size IIS requires.
I believe that IIS will reduce the image somewhat and i heard people mention you can upload a file that is 1.2mb in size and it will reduce it automatically but i haven't tried that.
You can also sign up and upload the image to Astrobin for high quality uploads + annotations and equipment information. You can get 10 free images with their sign up then paid after that.
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